从片段调用片段

Question

我有一个带有按钮的活动,当点击时我用片段上的另一个按钮调用片段.但是当点击片段的按钮时,我无法调用第二个片段.这是我的来源,非常简单:activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
tools:context=".MainActivity" >

<Button 
    android:id="@+id/btn_click"
    android:text="Call Fragment"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:onClick="onClick"
    />
</LinearLayout>

fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0"
android:orientation="vertical" >

<TextView 
    android:id="@+id/fragment1"
    android:text="Fragment 1"
    android:textSize="25sp"
    android:gravity="center"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    />

<Button 
    android:id="@+id/btn_frag2"
    android:text="Call Fragment 2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>

fragment2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0"
android:orientation="vertical" >

<TextView 
    android:id="@+id/fragment2"
    android:text="Fragment 2"
    android:textSize="25sp"
    android:gravity="center_vertical|center_horizontal"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    />
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

public void onClick(View v) {
    Fragment1 fragment1 = new Fragment1();
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(android.R.id.content, fragment1);
    fragmentTransaction.commit();
}

}

Fragment1.java

public class Fragment1 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment1, container, false);
    }

    public void onClick2(View view) {
        Fragment2 fragment2 = new Fragment2();
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.fragment1, fragment2);
        fragmentTransaction.commit();
    }
}

Fragment2.java

public class Fragment2 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment2, container, false);
    }
}

我的代码有什么问题？

Answer 1

我认为现在可以使用片段嵌套来更新后面的可计算性jar

现在让我们自己挖掘问题吧.

public void onClick2(View view) {
    Fragment2 fragment2 = new Fragment2();
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.fragment1, fragment2);
    fragmentTransaction.commit();
}

我认为R.id.fragment1属于一个TextView不包含子视图的好地方,因为它不是a ViewGroup,你可以textView从xml中删除并用一个LinearLayoutlet来替换它然后它会工作,如果没有告诉我什么错误.

fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0"
android:orientation="vertical" >

<LinearLayout 
    android:id="@+id/fragment1"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    />

<Button 
    android:id="@+id/btn_frag2"
    android:text="Call Fragment 2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>

更新评论中的错误

public class Fragment1 extends Fragment implements OnClickListener{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment1, container, false);
((Button) v.findViewById(R.id.btn_frag2)).setOnClickListener(this);
    return v;
}

public void onClick(View view) {
    Fragment2 fragment2 = new Fragment2();
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction =        fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.container, fragment2);
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();
}

}

Answer 2

如果要用Fragment2替换整个Fragment1,则需要在MainActivity中使用:

Fragment2 fragment2 = new Fragment2();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(android.R.id.content, fragment2);
fragmentTransaction.commit();

只需将此代码放在MainActivity中的方法中,然后从Fragment1调用该方法即可.